ACCOUNTING FOR CERTAIN LOANS ACQUIRED IN A TRANSFER - Carrying amount of loans included in balance sheet of loans receivable (Details) (Loans Receivable, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	$ 1,867	$ 1,873
Construction/Land
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	408	411
One-to-four family residential
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	1,038	1,035
Multi-family residential
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans
Commercial
Business Acquisition [Line Items]
Carrying balance of acquired credit-impaired loans	13	14
Dupont State Bank
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	2,651	2,703
Fair value adjustment for credit-impaired loans	(784)	(830)
Carrying balance of acquired credit-impaired loans	1,867	1,873
Dupont State Bank | Construction/Land
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	650	682
Dupont State Bank | One-to-four family residential
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	1,389	1,400
Dupont State Bank | Multi-family residential
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans
Dupont State Bank | Nonresidential real estate and agricultural land
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	562	568
Dupont State Bank | Commercial
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	24	24
Dupont State Bank | Consumer and other
Business Acquisition [Line Items]
Outstanding balance of acquired credit-impaired loans	$ 26	$ 29